Thales

Jean-Michel Hode

Patrick Garrec

Stéphane Kemkemian

Richard Montigny

Jean-Luc De Gouy

Rodolphe Cottron

Thierry Mazeau

Christophe Flouzat

Leila Kamoun

The invention relates to a method for filtering a numerical input signal sampled at a sampling frequency in order to obtain a filtered signal, the method being performed by a radar system and including at least one step for

Method for filtering with reduced latency and associated devices

The invention relates to a method for characterizing the effects of coupling of a radiofrequency transceiver apparatus comprising at least one transmit path and at least one receive path, and to an apparatus implementing the method. The method comprises the calculation of coefficients of a correcting filter, with the steps of: transmitting a known signal over a transmit path, receiving a signal over a receive path, calculating the coefficients of the correcting filter on the basis of the known signal and of the signal received over said receive path. The method further comprises a step, carried out during the transmission of a useful signal over the transmit path, of filtering the signal transmitted over the transmit path by means of said correcting filter in order to determine the transmitted signal received by coupling effect over the receive path.

Method for decoupling signals in transceiver systems

The invention relates to a method for simplifying a sampled signal digital filter, the method including at least one step for:

Method for simplifying a filter and associated devices

The invention relates to a method for filtering a numerical input signal sampled at a sampling frequency in order to obtain a filtered signal, the method including at least one step for:

Method for filtering with zero latency and associated devices

A wave transmitted by an antenna made up of an array of radiating elements, two pulse waves are transmitted, each modulated by a phase shift law known as modulation phase shift, the phase shifts being in opposition, a first wave being transmitted by a sub-array of radiating elements referred to as odd and the second wave being transmitted by a second sub-array of radiating elements referred to as even, the two sub-arrays being interleaved, the transmitted wave being the combination of the first wave and the second wave.

Method for modulating a microwave frequency wave, transmission system carrying out this method, and radar comprising a system of this type

A signal filtering method for filtering a numerical input signal that is sampled at a sampling frequency in order to obtain a filtered signal, the method including a first operation of application of a discrete Fourier transform to M points on a processed signal in order to obtain M points of the spectrum of the processed signal, each point of the spectrum of the processed signal corresponding to the even-numbered indices of a spectral analysis at 2*M points of the processed signal; and a second operation of application of a discrete Fourier transform to M points on the processed signal in order to obtain M points of the spectrum of the processed signal, each point of the spectrum of the processed signal corresponding to the odd-numbered indices of a spectral analysis at 2*M points of the processed signal.

Method for filtering a numerical input signal and associated filter

A method for determining parameters of a finite impulse response pulse compression filter, implemented by a multi-channel radar comprises: a step Etpof transmitting a calibration signal and of acquiring this calibration signal after propagation through the transmission channel, a step Etpof injecting the signal acquired, at the input of each of the reception channels, a step Etpof measuring the signal at the output of each reception channel, a step Etpof calculating the transfer function of the matched filters on the basis of the signals at the output of the reception channels, a step Etpof measuring the value of the average power at the output of the various reception channels and of calculating the relative gains between each of the reception channels and a predetermined reception channel on the basis of the measured values of average powers.

Method for determining parameters of a compression filter and associated multi-channel radar

In a method for correcting amplitude and phase offsets in a sigma-delta modulator having a loop including an integrator with a filter and an amplifier, an analog-to-digital converter, a digital-to-analog converter, and an adder-subtractor, an open-loop amplitude/phase frequency response of the modulator is estimated digitally. A phase offset value and an amplitude offset value are calculated by comparing the estimated open-loop amplitude/phase response with a reference amplitude/phase frequency response. The phase and gain offsets of the loop are then compensated for according to the estimated offset values. A sigma-delta modulator implements the method.

Method for correcting amplitude and phase offsets in a sigma-delta modulator and sigma-delta modulator implementing said method

In a method for improving resolution and for correcting distortions for a sigma-delta modulator, a modulator converts an analog input signal into a secondary output digital signal sampled at a frequency fand coded on Nbits, a second main output digital signal s'(t) is represented on Nbits also being available at the output. At least three processings are applied successively to the outputs, a first processing carrying out a demodulation by a frequency fand a decimation of factor N in an independent manner, z second processing carrying out an improvement of the resolution and a third processing carrying out a correction of the distortions. These three processings are carried out after decimation. A sigma-delta modulator implements the method.

Method for improving the resolution and for correcting distortions in a sigma-delta modulator, and sigma-delta modulator implementing said method

The present invention relates to a sigma-delta modulator to convert an analog signal into a digital signal using an analog-to-digital converter slaved in a closed loop. The undecided bits at the output of the analog-to-digital converter are assigned the same values in the digital output signal from the modulator as in the digital signal returned to the input of the modulator.

Sigma-delta modulator

A closed loop slaving device is provided for slaving a first component, the slaving device including a second component having a multiplicative noise. A compensation noise is added to the input signal of the slaving device, the compensation noise being substantially equal to the input signal of the slaving device multiplied by the multiplicative noise of the second component. A sigma-delta modulator is also provided to convert an analog input signal into a digital output signal by use of an analog-to-digital converter slaved in the closed loop slaving device.

Control closed-loop device and sigma-delta modulator

The disclosure pertains to continuous-time filtering. More particularly, it relates to filtering in a feedback control loop, for example in a sigma-delta (&#x3a3;&#x394;) modulator. The making of a filter for this type of application comes up against a major problem linked to the relativity between the amplitude and phase responses. This limits the possibilities of choice in order to take steps against the instability of the loop. A continuous-time filter with minimum phase variation carries out the bandpass integration of the signal presented at its input. The making of the continuous-time filter as a bandpass integrator raises the problem of achieving a compromise between gain variations and phase variations close to the &#x2212;1 critical point, This compromise must lead to the stability of the loop. This problem is resolved by using a continuous-time bandpass integrating filter comprising at least one resonance device with minimum phase variation.

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St. Cloud, France

Jean-Michel Hode